Not a comic book,
per se, but I'm sure that a large part--maybe the majority of the book-- is made up of comics.
It's The Comic Art of War: A Critical Study of Military Cartoons, 1805-2014, with a Guide to Artists, by Christina M. Knopf.
The least expensive copy of it at Amazon is the Kindle version, for $19.99. Today, WarGameVault has the PDF (watermarked) as their Deal of the Day for only
$7.49.
Thankfully, they consider the day to end in a little over 18 hours from now, so you should have plenty of time to grab the deal before it ends.
There are very few ratings for the book that I could turn up--not unexpected, given its specialized and scholarly subject and the fact that it was published only a couple of years ago. But the ratings that I did find were all 4's and 5's.
Helpful links:
WarGameVault's Deal of the Day webpage.
Amazon's webpage for the book.